Transformer casing



192 March 7 L. c. NICHOLS TRANSFORMER CASING Filed April 13, 1922 z a M Mom Patented Mar. 15, 19 27. i

EN OFFICE. 1;.-

LOUIS c. motions, or .WAUWATOSA, WIiSCONSIN,- nssrenoa T ALLIS-CHALMERS manurscrunme' com any, or MILWAUKEE, wIscoNsm, A c'onronnrron or DELAWARE.

TRANSFORMER CASING Application filed April 13, 1922. Serial No, 552,433.

This invention relates to transformercas ings and is particularlyadapted for use in transformers in which it is desired to have an oil or gas tight joint between the cover and the tank portions of the casing. It has been found that very high pressures are sometimes formed within transformer casings which may be enough to lift the cover 0d of the gasket on whichit rests. In cas i'ngs as ordinarily constructed this results in the gasket being blown out with the conse quent trouble and expense of replacing the gasket. It isone of the objects of this invent-ion toobviate these disadvantages Another object is the provision of a ,sim-.

ple and 'eflicientjoint construction which is:

at the same time easily and cheaply manufactured. Other objects will appear here1n+ after as the description of the invention proceed appear fromv this specification and the ac: companying drawings forming a part thereof and showing one embodiment of said invention, and all these novel features are in- 4 tended to be pointed out in the claims,

In the drawings Fig. 1 is amore or less 1 I struction thereof.

. cated some distance below the top of the g In the drawings a transformer proper 1, more or less diagrammatically shown, is disptised in a casing'comprising a tank2, and a cover 3 (The joint a between'the cover and tank is shown in detail in Fig. 2. The tank 2 is provided with a transversely outwardly extending flange 5, which is preferably 10- tank. The flange 5 is provided'withan up? provide a member having a T -shap ed cross-- wardl y extending head 6 and a downward extending bead j The beads 6,'7, together with the flange 5 section. The flange 5 is of annular form and 7 completely surrounds the tank and is prefer ably fastened to said tank by weldsfi, 10. Thebead 6, the flange 5 and the outer ,wall of tank 2 provide an annular recess in which 'a gasket 8 may be disposed. The" gasket maybe of any suitable materiah The cover 3 is here with an axially downwardly extending flange 11. Surrounding the flange 11 is an angle iron 12 providing an outwardly extending flange 13. Thepreferably fastened to the cover 3 by a weld 19.. Both the flange 11 and angle iron 12 may be'machiped flush with each other and are adapted to rest on the gasket 8. The fiange 13 is provided with any desired number of holes through which U-bolts 14.- may be-passed, and the lower end 15 of the bolts 14 may be provided with a nut 16 which is preferably fastened to the bolt as by upsett1ng,the latter. A means is thus provided whereby the-bolt 14 may pass around underneath and inside of thebead 7. The bolts course to be understood that any other suitable form of bolts may be utilized, The novel features of the invention will The relative size of the cover and tank are here shown as such that a space 18 is provided therebetween. Pressure within the transformer casing will be transmitted, through the medium under pressure in the tank, into the space'18 and will thus tend to force the gasket into the recess in which it is located and spread the same. The construction is moreover such that even it the pressure is suficiently high to slightly lift the cover 3, thegas or'other medium under pressure within the casing will not, in blowing out of the tank, carry the gasketwith it.

When the casing is completely oil-filled,

shown as provided angle iron 12 is for example, and it is desired to remove the cover 3, the casingis drained. In order to avoid the space 18 remaining filled with oil, one or more'holes, 20, through tank 2 into th s space may be provided. If desired these holes may be made of the proper size so'that they may be used for lifting the tank.

It should be understood that it is not desired to limit the invention to the exact details of construction shown and described, for obvious modifications may occur to persons skilled in the art.

It isflcla'nned and desired to secure Letters Patent:

1. A casing in which high fluid pressures are apt to develop comprising a tank, a

cover therefon-a gasket between said cover and tank, and means for preventing said gasket from being blown out by high pressure within said casing including the pro- .vision on the outer periphery of. said tank annular recess ,in'whiohsaid gasket is annular member,

of an disposed, thetop of said gasket being below the upper edge of said tank, "the portion of the cover in contact with said gasket having an inside diameter greater than the adjacent, outside diameter of said tank and greater than the inside diameter of said gasket whereby pressure originating within said casing will force said gasket into said recess. v

2. A casing comprising a tank, an annular -member surrounding and fastened to said tank near its open end, said annular mem-" "adapted to "be immersed to develop high pressure her being of T section with the cross bar of the T vertical and forming the periphery of said annular member, a cover adapted to cooperate with the recess formed by said shaped bolts-engaging said cover and the 1 underside of said cross bar.

- member,

3. A casing comprising a tank, an annular near its open with ;the cross bar of the T vertical and forming the outer periphery of said annular aweld for holding said annular member to said tank, a cover adapted to cooperate with the recessformed by said iron bent to annular form, around the outer edgeof said cover,

a-weld for holding sald angle iron to said cover, and hook-shaped bolts passing through said angle iron and. unde'r said annular member.

and detachable hook- 4. A casing gomprising aztank completely filled'with a liquid, means .p-roviding an annular recess around said tank in which a gasket may be disposed, the top of the gas-. ket being below the upper edge of said tank, a cover having an axially extending flange resting on saidgaskeigtheinner diameter of said flange beinggreater than the outer diameter of said tank, said tank being pro ,vided with a' hole whereby liquid may be drained out of the space between the coverflange and tank. I

5. In combination, a casing comprising an oil-containing tank, electrical apparatus in said oil and apt due to electrical effects, a cover for saidtank, a gasket between said cover and tank, and means for preventing said gasket from being blown out by high pressure within said casing including the provision on the outer periphery of said tank of an annular within said casing recess'in which-said gasket is disposed, the

top of said gasket being below the upper edge of said tank, theportion of the cover in contact with said gasket having an in-' side diameter greater than the adjacent outside diameter of sald tank and greater than I theinsidediameter of said gasket whereby" pressure originating within said casing will force said gasket into said recess.

In testimony whereof,the"s1gnature of the inventor is aflixed hereto.

ouise; NI HOLS. 

